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| DOI | Trouver le DOI : https://doi.org/10.1094/MPMI-06-23-0077-R |
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| Auteur | Rechercher : Fortier, Colleen E.1; Rechercher : Musso, Antonia E.1; Rechercher : Evenden, Maya L.1; Rechercher : Zaharia, L. Irina2; Rechercher : Cooke, Janice E. K.1Identifiant ORCID : https://orcid.org/0000-0002-4990-628X |
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| Affiliation | - University of Alberta
- Conseil national de recherches Canada. Développement des cultures et des ressources aquatiques
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| Bailleur de fonds | Rechercher : Natural Sciences and Engineering Research Council of Canada; Rechercher : Alberta Agriculture and Forestry; Rechercher : fRI Research; Rechercher : Manitoba Conservation and Water Stewardship; Rechercher : Canadian Forest Service; Rechercher : Environment and Natural Resources, Northwest Territories; Rechercher : Ontario Ministry of Natural Resources and Forestry; Rechercher : Ministry of Environment - Saskatchewan; Rechercher : West Fraser; Rechercher : Weyerhaeuser; Rechercher : Genome Alberta; Rechercher : Genome Canada; Rechercher : Alberta Innovates; Rechercher : University of Alberta |
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| Format | Texte, Article |
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| Sujet | bark beetle; ethylene; jasmonic acid; phenolics; plant defense; Dendroctonus ponderosae; Grosmannia clavigera; Pinus contorta |
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| Résumé | Mountain pine beetle (MPB; Dendroctonus ponderosae Hopkins) is a devastating forest insect pest that has killed millions of hectares of pines in western North America over the past two decades. Like other bark beetles, MPB vectors ophiostomatoid fungal species, some of which are pathogenic to host pine species. The phytopathogenicity of these fungal symbionts has sparked considerable debate regarding their role in facilitating MPB attack success. We tested the hypothesis that MPB ophiostomatoid fungal associates like Grosmannia clavigera (Robinson-Jeffrey and Davidson) Zipfel, de Beer and Wingfield contribute to overwhelming host defenses during MPB mass attack. We compared responses of mature lodgepole pine ( Pinus contorta Dougl. ex Loud. var. latifolia Engelm.) trees growing in natural stands that were mass attacked by MPB with those inoculated with G. clavigera by examining host defense hormones, secondary metabolites, and gene expression profiles. The jasmonate and ethylene signatures of necrotrophic pathogen-triggered response were identified in G. clavigera-inoculated trees, but only the jasmonate signature of a herbivore-triggered response was measured in MPB-attacked trees. Several G. clavigera-induced changes in pine phenolic metabolite profiles and phenolic biosynthesis gene expression patterns were absent in MPB-attacked pines. These findings indicate that ophiostomatoid fungi like G. clavigera are not a major factor in overwhelming host defenses during MPB mass attack. Instead, fungal pathogenicity likely is more important in aiding MPB colonization and development within the host tree. Phenolics appear to play a larger role in the host response to G. clavigera than to MPB, although phenolics may also influence MPB feeding and behavior. |
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| Date de publication | 2024-05-22 |
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| Maison d’édition | The American Phytopathological Society |
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| Déclaration de droit d’auteur | |
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| Licence | |
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| Données connexes | |
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| Langue | anglais |
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| Publications évaluées par des pairs | Oui |
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| Exporter la notice | Exporter en format RIS |
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| Signaler une correction | Signaler une correction (s'ouvre dans un nouvel onglet) |
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| Identificateur de l’enregistrement | afe293ed-4329-42b4-b7a1-d07f8c901cb0 |
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| Enregistrement créé | 2026-05-01 |
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| Enregistrement modifié | 2026-06-22 |
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